Hmm... that's not going to run well at all. Not a bit, sorry. I have the same CPU in a mini PC I use for emulating games on my HDTV. It's good enough for everything up until PSX/N64 era stuff, along with handhelds up to the PSP (not every game in PPSSPP is so forgiving though, but definitely playable at 480p). Dolphin is simply out of the question, especially for the games you listed. None of them will work fullspeed, or even at a roughly enjoyable speed. 1.8 GHz simply isn't enough.
On the bright side, there are plenty of other opportunities for emulation, just not from Dolphin.
On the bright side, there are plenty of other opportunities for emulation, just not from Dolphin.